Test your historical sleuthing skills and help the Grand Rapids Public Library Special Collections Department find out more about the men in this photograph.

According to library staff, this photo shows grocery student managers for Kroger Co. in a class of some sort on Jan. 8, 1936. On the left wall is a poster showing proper lamb butchering cuts. The company pioneered on-site bakeries as well as bringing general grocery and meats under one roof.

Kroger had 50 stores throughout Grand Rapids in 1936, according to library staff. Today, the closest Kroger store to Grand Rapids is in Lansing.

According to the Kroger website, the company boasts more than 2,400 stores in 31 states under two dozen banners, and has annual sales of more than $96 billion.

The image comes from the Robinson Studio Collection, No. 125 at the library. It was chosen as a recent addition to the library's online Archival Digital Collections.

If you can help identify any of these people, place a comment below and/or send an email to Karolee Tobey at the Grand Rapids Public Library. Identities are added to the library index so future generations can find these photos of family and friends.

This “Photo Sleuth” is featured in Advance Newspapers' Mature Lifestyles Monthly, available at libraries and other local locations. It's a periodic feature on MLive.com/Grand-Rapids.